A convergent synthesis of (+)-pancratistatin based on intramolecular electrophilic aromatic substitution
作者:Timothy J. Doyle、Martin Hendrix、Donald VanDerveer、Sahar Javanmard、John Haseltine
DOI:10.1016/s0040-4020(97)00373-6
日期:1997.8
A convergent formal synthesis of (+)-pancratistatin (1) is reported. Specifically, an optically active adduct of piperonyl bromide and acetonated conduritol A was converted to a late-stage intermediate from the Danishefsky-Lee synthesis of 1. The carbon skeleton was established via intramolecular electrophilic aromatic substitution within the piperonylated conduritol. Some competitive cationic rearrangement
报道了(+)-胰抑素(1)的收敛形式合成。具体而言,将哌啶基溴化物和乙酰化的conduritol A的旋光加合物从Danishefsky-Lee合成1转化为后期中间体。碳骨架是通过在胡椒基化的conduritol中进行分子内亲电芳族取代而建立的。在该操作中观察到一些竞争性阳离子重排,这取决于哌啶基结构域中的2-取代基偏向于哌啶基苄基碳的ipso攻击的程度。